Scour monitoring system of subsea pipeline using distributed Brillouin optical sensors based on active thermometry

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• 作者：Xue-Feng Zhao^a ; ^{zhaoxuefeng1977@gmail.com} ; Le Li^a ; Qin Ba^a ; Jin-Ping Ou^a ; ^b
• 关键词：Subsea pipeline ; Scour monitoring ; Brillouin optical sensors
• 刊名：Optics and Laser Technology
• 出版年：2012
• 期刊代码：48_00303992
• 类别：ph
• 出版时间：October, 2012
• 卷：44
• 期：7
• 页码：2125-2129
• 文件大小：569 K

摘要

A scour monitoring system of subsea pipeline is proposed using distributed Brillouin optical sensors based on active thermometry. The system consists in a thermal cable running parallel to the pipeline, which acquires frequency shift of optical sensors during heating and cooling, directly indicating temperature change. The free spans can be detected through the different behaviors of heat transfer between in-water and in-sediment scenarios. Three features were extracted from temperature time histories including magnitude, spatial continuity and temporal stability. Several experimental tests were conducted using the proposed system. The results substantiate the monitoring technique.